ML14212A772

Email Response to Debbie Grinnell Reference Question to Core Samples Tensile Strength at Seabrook Station

ML14212A772
Person / Time
Site:	Seabrook
Issue date:	07/30/2014
From:	Mel Gray Engineering Region 1 Branch 1
To:	Grinnell D C-10 Foundation
Gray M
References
Download: ML14212A772 (2)

Text

Heater, Keith From: Gray, Mel Sent: Wednesday, July 30, 2014 5:04 PM To: Heater, Keith

Subject:

FW: Response to Question related to cores at Seabrook Station include this email in the edats item R1-2014-0216 closure. Thanks.

From: Gray, Mel Sent: Wednesday, July 30, 2014 5:03PM To: Debbie Grinnell <[ I Cc: William Cook 7 II a 2 * > ::::::~

c*-:*

James Trapp )

Subject:

Response to Question related to cores at Seabrook Station

Debbie, Your email to Jim Trapp below indicated core samples were taken from containment by NextEra staff at the Seabrook Station some months ago and questioned whether the NRC requested tensile strength data from these samples. We are unaware of any core samples taken from the Seabrook containment.

Going forward, our next inspections focused on the ASR-affected structures at the Seabrook Station will be completed in the fall 2014 and documented in our third quarter integrated inspection report for the Seabrook Station, to be issued in early October 2014. If we determine there are recent core samples from Seabrook structures affected by ASR, we would review the testing and results as part of this near term scheduled inspection activity.

from: Trapp, James Sent: Thursday, July 17, 2014 3:58 PM To: Debbie Grinnell Cc: Gray, Mel; Cook, William

Subject:

RE: Question.

From: Debbie G r i n n e l l [ - ]

Sent: Thursday, July 17, 2014 11:43 AM To: Trapp, James

Subject:

Question.

Hello Jim, I hope you all at SAITT know that the agreement the NRC has made with NIST "Structural Performance of Nuclear Plant Concrete Structures Affected by ASR" is from our standpoint an important step forward. Hopefully when the proposal is detailed with specifics, we can begin (even as opponents) to know the right process to achieve the scientific integrity required is being undertaken. To know what can done if mitigation is possible and have a baseline to proceed with SOME idea of the extent to begin to look at the rate of progression from sound reliable research to know what next necessary steps are realistic.

Meanwhile, I will continue to pursue the extent of condition on the actual concrete as Seabrook has we all know Seabrook has been out-of-design basis for years and we still don't have enough data from existing ACI codes for testing that should be utilized 1

to get an extent of the existing condition inside the walls, and from the rebar and anchors. For example, I know several cores were taken from containment that Nextera choose not to pursue for tensile strength data. They should have been and I know you and others in the NRC that share with our expert that critical data including tensile strength needs to be known and testing repeated. Richard Conte stated two years ago the list of material properties that needed to be known, and we still have no data results to assess.

Could you tell us if the NRC has requested in ther extent of condition that tensile strength data be obtained from the cores that were taken months ago.

Thank you, Debbie 2